Tank mixture proportioning gauge



FIG. 1 is a top and right front perspective view of a tank mixture proportioning gauge showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top and right front perspective view of another embodiment of my new design of FIGS. 1-5;

FIG. 7 is a front elevational view thereof;

FIG. 8 is a left side elevational view thereof;

FIG. 9 is a top plan view thereof;

FIG. 10 is a bottom plan view thereof. 

The ornamental design for the tank mixture proportioning gauge, substantially as shown and described. 